Interoperability milestones achieved as PQ clients near Devnet-3 readiness tests

Client readiness for Devnet-3 improves with several clients nearing interop testing. Lantern is ready to release its Devnet-3 image, while Zeam awaits other clients' readiness. Ethlambda is testing Devnet-3 implementation. Ream is debugging self-finalization tests and expects a Docker image soon. Nimbus is absent from the call, but Grandine reports multiple Devnet-2 fixes, making progress towards Devnet-3.